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TO ALL WHOM IT MAY CONCERN:

Be it known that YI, GEORGE H. DIMOND, of Bridgeport, in tlie county ofFairfield, and State of Connecticut, have invented a new and usefulImprovement in Friction-Springs for Slatsor Blinds, of which thefollowing is a full, clear, and exact description, reference being hadto the accompanying'dralwings, which make part of-this specification,and in which- Figure 1 represents a view in perspective of a' shutterwith turning-slats,'to which myinvention is applied.

Figure 2 is a top view of the spring, and

Figure 3 a section through the same. l i f In the inside shutter, now socommonly used, having turning-slats, `much annoyance is occasioned bythe slats turning on their pivots, owing to the weight of the rod whichconnects themto eachother, and thus 'admit ting more light than isdesirable for comfort.

It is the object of my'invention to retain turning-slats in anydesiredposition, and to this end my improvement consists in the use of aconcavo-convex discoidal-shaped spring,hving a slot extending from itscircumference to its centre in order that it may slip over the pivot ofthe slat, between the end of the slatand the frame, and thus lock theslats in any desired position.

- In the accompanying drawings, a concave-convex disk, A, which may bestamped or cut from any suitable metal,ris shown as provided with aslot, a, extending from its circumference to its centre. This springi'sajnserted` edgewise between the end of one of the slats and theframe, with its concave side towards the frame, its slot enabling it toembrace the pivot. of the slat. The pressure caused by the elasticity4of the diskaholds the Slat at 4any angle at which it may be turned, andas' all the slats of a panel are connected with the same bar, one springis suiicient to hold them all in position.

As the disk can readily be used vin connection with the ordinary blindswithout altering them, itsadvantages` are obvious.

What I claim as my invention, and desire to `secure by Letters Patent,is y A slotted concavo-convex discoidal-shaped spring, constructedsubstantially as described, for the purpose of locking turning-slats inposition, -as set forth. t

In testimony whereof I have hereunto subscribed my name.

GEORGE H. DIMOND.

Witnesses:

GEORGE C. BISHOP, JAMES A. HOUSE.

